GENERAL SPECIFICATION FOR AIR-CONDITIONING, …

1 GENERAL SPECIFICATION FOR AIR- conditioning , refrigeration , ventilation AND central MONITORING & CONTROL SYSTEM INSTALLATION IN GOVERNMENT BUILDINGS OF THE HONG KONG SPECIAL ADMINISTRATIVE REGION 2017 EDITION ARCHITECTURAL SERVICES DEPARTMENT THE GOVERNMENT OF THE HONG KONG SPECIAL ADMINISTRATIVE REGION PREFACE This GENERAL SPECIFICATION aims to lay down the technical requirements of materials and equipment, the standards of workmanship, the requirements on testing and commissioning and operation and maintenance as well as requirements on document submissions for Air- conditioning , refrigeration , ventilation and central Monitoring & Control System Installation in Government Buildings of the Hong Kong Special Administrative Region (HKSAR).

2 The 2017 edition of this GENERAL SPECIFICATION was developed from the 2012 edition (incorporation Corrigendum No. GSAC02-2012) by the Air- conditioning Specialist Support Group that was established under the Building Services Branch Technical Information and Research & Development Committee of the Architectural Services Department (ArchSD). It incorporates updated international standards and codes as well as technological developments which find applications in Hong Kong. To be in line with the Department s endeavour to reduce the environmental burden on our neighbours and to help preserving common resources while improving the quality of our service, this GENERAL SPECIFICATION puts emphasis on green features and green practices for construction as well as initiatives for enhancement of client satisfaction on completed projects.

3 With the benefit of information technology , electronic version of this edition is to be viewed on and free for download from the ArchSD Internet homepage. As part of the Government s efforts to limit paper consumption, hard copies of this GENERAL SPECIFICATION will not be put up for sale. The draft of the 2017 edition has been circulated to stakeholders within and external to the Government before finalisation. Nevertheless, the ArchSD welcomes comments on its contents at any time since the updating of this GENERAL SPECIFICATION is a continuous process for the inclusion of any developments that can help meeting the needs of our community. DISCLAIMER This GENERAL SPECIFICATION is solely compiled for Air- conditioning , refrigeration , ventilation and central Monitoring & Control System Installation carried out for or on behalf of the ArchSD in Government buildings of the HKSAR.

4 There are no representations, either expressed or implied, as to the suitability of this GENERAL SPECIFICATION for purposes other than that stated above. Users who choose to adopt this GENERAL SPECIFICATION for their works are responsible for making their own assessments and judgement of all information contained here. The ArchSD does not accept any liability and responsibility for any special, indirect or consequential loss or damages whatsoever arising out of or in connection with the use of this GENERAL SPECIFICATION or reliance placed on it. The materials contained in this document may not be pertinent or fully cover the extent of the installation in non-government buildings and there is no intimated or implied endorsement of the sales, supply and installation of the materials and equipment specified in this GENERAL SPECIFICATION within the territory of the HKSAR.

5 Table of Contents Page 1 of 20 AC_GS 2017 Edition TABLE OF CONTENTS PART A - SCOPE AND GENERAL REQUIREMENTS SECTION A1 SCOPE OF SPECIFICATION Installations to comply with this GENERAL SPECIFICATION Scope of the Installations Terms and Definitions Singular and Plural SECTION A2 STATUTORY OBLIGATIONS AND OTHER REGULATIONS Statutory Obligations and Other Requirements Case of Conflict Mechanical Fire Service Installation SECTION A3 EXECUTION OF INSTALLATIONS The International System of Units (SI) Programme of Installations Builder s Work Coordination of Installations Cooperation with Other Contractors Site Supervision Sample Board Advice of Order Placed Record of Materials Delivery Protection of Materials and Equipment Label Warning Notice Guard and Railing for Moving and Rotating Parts of Equipment Service Condition Voltage Covered by This GENERAL SPECIFICATION Material and Equipment Workmanship Surveys and Measurements Table of Contents Page 2 of 20 AC_GS 2017 Edition SECTION A4 DRAWINGS AND MANUALS Drawings in Electronic Format Installation Drawings As-built Drawings Operation and Maintenance (O&M)

6 Manual and User Manual Table of Contents Page 3 of 20 AC_GS 2017 Edition PART B - GENERAL TECHNICAL REQUIREMENTS (INSTALLATION METHODOLOGY) SECTION B1 AIR CLEANING EQUIPMENT GENERAL Washable Panel Filter Automatic Viscous Filter Disposable Panel Filter Disposable Pleated Panel Filter Renewable Panel Filter Automatic Fabric Roll Filter Bag Filter Cartridge Filter High Efficiency Particulate Arrestance (HEPA) Filter Automatic Reclean able Filter Automatic Reclean able HEPA Filter Automatic Reclean able High Voltage Electrostatic Filter Gas Filter Activated Oxygen Air Purifier Ultra-Violet (UV) Sterilising Light Water Scrubber SECTION B2 DUCTWORK GENERAL Design and Accessories Hangers and Supports Flexible Duct Joints Flexible Ductwork Ductwork Acoustic Treatment Extract Hoods and Valances for Kitchens Grease Filter Ductwork Cleaning Points Testing SECTION B3 AIR HANDLING AND TREATMENT GENERAL Table of Contents Page 4 of 20 AC_GS 2017 Edition Air Handling Units (AHUs)

7 Axial Flow Fans Ceiling Fans Centrifugal Fans Fan Coil Units Cassette Type Fan Coil Units Mixed Flow Fans Mechanical Roof Extract Units Propeller Fans Protectively Coated Fans and Fans for Corrosive or Hazardous Applications Rotary Fans In-line Centrifugal Fans EC Plug Fans Jet Fans Conducting Fans Terminal Air Control Devices Grilles and Diffusers Domestic Exhaust Fans SECTION B4 AUTOMATIC CONTROL Automatic Control System (ACS) GENERAL Requirements Air Cooling Control Air Heating Control Electrical/Electronic (Localised) Control System SECTION B5 central CONTROL AND MONITORING SYSTEM (CCMS) GENERAL Requirements System Architecture Electrical Wiring Hardware Installation Software Installation SECTION B6 central refrigeration MACHINE, DIRECT EXPANSION EVAPORATORS AND HEAT REJECTION PLANT Table of Contents Page 5 of 20 AC_GS 2017 Edition GENERAL Layout and Isolation of Plant Components Delivery of Equipment refrigeration Pipework and Fittings Air-cooled Packaged refrigeration Machine Water-cooled Packaged refrigeration Machine Air-cooled Condenser Air-cooled Evaporator Cooling Tower Heat Recovery Chillier Total Energy Heat Pump Vibration Isolation Electrical Work Safety Ancillaries for Ammonia refrigeration Machine Solar Heating System SECTION B7 ELECTRIC MOTORS AND ELECTRICAL EQUIPMENT Low Voltage - GENERAL Low Voltage - Electric Motors Low Voltage - Variable Speed Drives Low Voltage - Motor Switchgear.

8 Starter and Control Panels Low Voltage - Automatic Power Factor Correction Capacitors High Voltage - Electric Equipment SECTION B8 NOISE AND VIBRATION CONTROL GENERAL Equipment Bases Vibration Isolators Plant/Equipment Vibration Isolation Pipe work Vibration Isolation Ductwork Vibration Isolation Ductwork Acoustic Insulation Acoustic Duct lags Ductwork Silencers Acoustic Doors Acoustic Louvers Table of Contents Page 6 of 20 AC_GS 2017 Edition Acoustic Enclosures Plant Room Acoustic Linings Floating Floors Specialist Manufacturer's Inspection Independent Inspections SECTION B9 PIPEWORK, VALVES, COCKS AND STRAINERS GENERAL Automatic Air Vents Bellow Expansion Joints/Anchors and Guides Changes in Pipe Size Connections in Pipe work Flow Measuring Flushing Down and Drainage Joints and Fittings for Steel Pipe work Joints and Fittings for Copper Tubes Pipe work GENERAL Details Pipe work Layout Pipe work Supports.

9 Expansion Joints and Anchor Points Pipe work Vibration De-couplers Plastic Pipe work Specialised Hydraulic System Balancing Valves 'T' and 'Y' Fittings Supports for Pipe work Welding and Brazing Labelling and Circuit Control Diagram of Valves SECTION B10 SYSTEM MONITORING INSTRUMENT GENERAL System Static Pressure Gauges for Air Distribution Systems Thermometers - Air Immersion Thermometers - Liquid Immersion Pressure Gauges for Water Systems Self Sealing Test Points Voltage and Current Readings Power Factor Monitoring Power Consumption Metering Liquid Flow Rate Metering Table of Contents Page 7 of 20 AC_GS 2017 Edition Other Types of Metering Devices Provision of Metering Facilities SECTION B11 THERMAL INSULATION GENERAL Types of Thermal Insulation Materials Pipe work Fittings Chilled Water Pumps and Accessories Ductwork and Air Handling Plant - Methods of Application Chilled Water Pipe work and Equipment - Materials and Finishes Chilled Water Pipe work and Equipment - Methods of Application Painting and Identification SECTION B12 UNITARY AIR-CONDITIONER GENERAL Installation and Servicing Anti-Vibration Mounting Casing Compressor Supply Air Fan and Motor Cooling and Heating Coils Air Filter Air-cooled Condensers Electric Ductwork Heaters Refrigerant Piping Condensate Drain Pipe Minimum Installation Requirements of Safety and Operational Control for Unitary Air-Conditioners Single Packaged Air-Conditioner Packaged Air-Conditioner with Remote Condenser Split Condensing Unit and AHU Variable Refrigerant Volume System Maintenance

10 Servicing Platform SECTION B13 WATER HANDLING EQUIPMENT Table of Contents Page 8 of 20 AC_GS 2017 Edition GENERAL Pump Installation Requirements Storage Centrifugal Water Pumps Common Installation for Boiler Feed-water, Fresh Water and Saline Water Pumps Sump Pumps Bore Well Pumps Plant Room Location Pump Foundation Pump Alignment Grouting of Pump Base Support for Piping Connection Piping to Pump Suction Piping Delivery Piping Pipe Flanges Expansion Joints Intake Suction Strainers Venting Valves for Pump-Set Drains for Pump-Set Instrumentation Feed and Expansion Tank Water Filters Plate Type Heat Exchanger Sea Water Strainer Table of Contents Page 9 of 20 AC_GS 2017 Edition PART C - GENERAL TECHNICAL REQUIREMENTS (MATERIAL AND EQUIPMENT SPECIFICATION ) SECTION C1 AIR CLEANING EQUIPMENT GENERAL Standards Washable Panel Filter Automatic Viscous Filter Disposable Panel Filter Disposable Pleated Panel Filter Renewable Panel Filter Automatic Fabric Roll Filter Bag Filter Cartridge Filter High Efficiency Particulate Arrestance (HEPA) Filter Automatic Reclean able Filter Automatic Reclean able HEPA Filter Automatic Reclean able High Voltage Electrostatic Filter Gas Filter Activated Oxygen Air Purifier Ultra-Violet (UV) Sterilising Light Water Scrubber Washing Facilities for Washable Filter Filter Pressure Differential Measurement and Indication Additional Requirements (Spare Filter Media)